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authorJohan Hovold <jhovold@gmail.com>2012-05-10 19:18:29 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2012-05-20 17:27:02 +0200
commit6fa4b9d802610116adf4b89c2f9bd155829aafd3 (patch)
treec03e8909ea06806fa2bf33b0f774d0ab168457a8 /drivers/mfd/lm3533-ctrlbank.c
parent7af5e87dc5e6b6f413ba95b06e06ebf810687858 (diff)
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mfd: Use SI-units for the lm3533 max-current interface
Use SI-units (uA) for max-current interface (5000 - 29800 uA). Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/lm3533-ctrlbank.c')
-rw-r--r--drivers/mfd/lm3533-ctrlbank.c43
1 files changed, 29 insertions, 14 deletions
diff --git a/drivers/mfd/lm3533-ctrlbank.c b/drivers/mfd/lm3533-ctrlbank.c
index adf4c1a542a..a4cb7a5220a 100644
--- a/drivers/mfd/lm3533-ctrlbank.c
+++ b/drivers/mfd/lm3533-ctrlbank.c
@@ -17,8 +17,11 @@
#include <linux/mfd/lm3533.h>
+#define LM3533_MAX_CURRENT_MIN 5000
+#define LM3533_MAX_CURRENT_MAX 29800
+#define LM3533_MAX_CURRENT_STEP 800
+
#define LM3533_BRIGHTNESS_MAX 255
-#define LM3533_MAX_CURRENT_MAX 31
#define LM3533_PWM_MAX 0x3f
#define LM3533_REG_PWM_BASE 0x14
@@ -65,6 +68,31 @@ int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
}
EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
+/*
+ * Full-scale current.
+ *
+ * imax 5000 - 29800 uA (800 uA step)
+ */
+int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
+{
+ u8 reg;
+ u8 val;
+ int ret;
+
+ if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
+ return -EINVAL;
+
+ val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
+
+ reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
+ ret = lm3533_write(cb->lm3533, reg, val);
+ if (ret)
+ dev_err(cb->dev, "failed to set max current\n");
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
+
#define lm3533_ctrlbank_set(_name, _NAME) \
int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val) \
{ \
@@ -102,19 +130,6 @@ lm3533_ctrlbank_set(brightness, BRIGHTNESS);
lm3533_ctrlbank_get(brightness, BRIGHTNESS);
/*
- * Full scale current.
- *
- * Imax = 5 + val * 0.8 mA, e.g.:
- *
- * 0 - 5 mA
- * ...
- * 19 - 20.2 mA (default)
- * ...
- * 31 - 29.8 mA
- */
-lm3533_ctrlbank_set(max_current, MAX_CURRENT);
-
-/*
* PWM-input control mask:
*
* bit 5 - PWM-input enabled in Zone 4